Currently there is no automated thing, but you can control it via .htaccess if you are running on apache. Just place an .htaccess file in yur main directory to "ban" that range of ip addresses from accessing, or directing that ip block to an "unregistered" group that can only "read only" the board and not register. The last part can be probably asked for as a hack.
IF you're on another type of server, I dont know how you can limit access.
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